問題詳情

87. X in limited amount is present in soil and is essential for plants nutrients but if present in highconcentration can be harmful both for plants, animals and aquatic organisms. What is X?
(A) Hydrogen sulphide
(B) Carbon dioxide
(C) Ammonia
(D) Water
(E) All of above

參考答案

答案:C
難度:計算中-1
書單:沒有書單,新增